query_question: The storage height of a small homogeneous earth dam is 16m, and the flow network is shown in Figure 1-5. The interval of the water head gradient equipotential lines in the flow network is evenly divided into m=22 (the number of equipotential lines calculated from downstream is shown in the figure). The G point in the earth dam is located on the 20th equipotential line, 11.5m above the ground level. May I ask which of the following options is the closest to the pore water pressure at point G? ()<image 1>
options: ['30kPa', '45kPa', '115kPa', '145kPa']
demo_question_list: There is a device with a current actual value of P=8000 yuan and an estimated residual value of LN=800 yuan. The first year's The operating cost of the equipment is Q=600 yuan, and the annual deterioration increment of the equipment is equal. The annual deterioration value $\lambda $= four hundred Yuan, then the economic life of the equipment is () years.<image 1>
  A.  7.5
  B.  7.5
  C. 8
  D.  6
  
  Answer with the option's letter from the given choices directly. What do satellite 1, 2, 3 separately monitor in <image 1>?
  A. Earth's energy balance, Earth's water cycle, Earth's surface
  B. Earth's water cycle, Earth's energy balance, Earth's surface
  C. Earth's surface, Earth's water cycle, Earth's energy balance
  D. Earth's surface, Earth's energy balance, Earth's water cycle
  
  Answer with the option's letter from the given choices directly. In the illustrated circuit, the consumption power of load RL is 72W. If the transformer voltage ratio k=5, the effective value of the transformer is U1 ()<image 1>
  A. equal to 120V
  B. equals to 4.8V
  C. and equals to 0.6V
  D. cannot be calculated
  
  Answer with the option's letter from the given choices directly. The settlement calculation method considering stress history requires the indicators provided by the survey, in addition to the pre consolidation pressure In addition to force, compression index, and porosity ratio, the other indicators that should be provided are ()<image 1>
  A. Effective self weight pressure
  B.  Rebound index
  C. Average additional pressure
  D. Groundwater level
  
  Answer with the option's letter from the given choices directly.